For those wondering. "A level 100 Shuckle can potentially deal the most damage in one single attack through the use of numerous stat boosters; by using Helping Hand by two different Pokémon in a Triple battle, holding a Metronome, Power Trick, a Skill Swap to Pure Power or Huge Power, 6 Attack boosts, and a Mimiced Me First used on a slower Pokémon using the Defense Curl/Rollout combo. Also, Shuckle's partner must have the ability Flower Gift and the weather must be sunny. On the 5th turn of using Rollout consecutively without any misses, if used against a level 1 Ledyba, Yanma or Combee with minimum Defense stats, that have been hit with negative Defense modifiers (such as Screech), it can deal 481,266,036 damage with a critical hit."

A level 100 Shuckle can potentially deal the most damage in one single attack through the use of numerous stat boosters; by using Helping Hand by two different Pokémon in a Triple battle, holding a Metronome, Power Trick, a Skill Swap to Pure Power, 6 Attack boosts, and a Mimicked Me First used on a slower Pokémon using the Defense Curl/Rollout combo. Also, Shuckle's partner must have the Ability Flower Gift and the weather must be sunny. On the 5th turn of using Rollout consecutively without any misses, if used against a level 1 Ledyba, Yanma or Combee with minimum Defense stats, that have been hit with negative Defense modifiers (such as Screech), it can deal 481,266,036 damage with a critical hit.

no, what he's saying is that you need to be a lvl 100 with full buffs hitting a fully debuffed lvl 1 on a triple (3vs3) pokemon battle, also, it needs to be the pokemon with the biggest raw power vs one with the lowest, that means that you can never really pull this on a real game unless you spend whole day with a friend, both spending huuuuge amounts of time to get all pokemons right to finally try this, BUT, this is 100% pointless!